Paint and varnish remover.



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CARIJETON ELLIS, F LARCHMONT, NTEW YORlK, ASSIGNOR T0 GHADELOID CHEMICL COMPANY, 0F NEW YORK, Y., A CORPORATION OF WESlIl VIRGINIA.

spei'fmation of Letters Patent.

PAINT AND VARNISH Patted June 15, 1915..

No Drawing. Original application led February 26, 1902, Serial No. 359,509.. Divided and this application filed August 6, `190'?.

ToV all 'whom/ it may concern Be it known that I, CARLETON ELL'Is, a

I citizen of the United States, and a resident of Larchmont, Westchester county, State of New York, have invented a new and useful Improvement in Paint and Varnish Rel movers, of which the' following is a specification, this being a divisional application based on the disclosure of my application Serial No. 359,509, filed February 26,1907, which discloses and claims. the invention more broadly than this case which is limited to removers comprising butyric acid in connection with various other components.

My invention -relates to paint and varnish removers of an acid character and especially to those containing a vola-tileinstead of a non-volatile acid so that when the coating ofpaint or varnish hasbeen removed any acid remaining on the treated surface may quickly evaporate and leave the same in a i'it condition for the application of a new finish coating.

My invention is designed to'provide an especially efficient remover for coatings containing readily decomposable paint pigments, such as the carbonates, among which white lead is the most noteworthy example. When my remover is applied to such coatings the pigments are immediately attacked by the acid and rapidly disintegrated under the influence of the chemical action. In the `case of carbonates this actionvis especially eEective owing to the simultaneous mechanical disintegration of the paint or varnish coating due to the evolution and escape of carbon dioxid. The'evolution of gas also increases the eiliciency of the neutral volatile solvents present to amarked degree ash the latter are subjected to a continual agitation thereby, resulting in submitting the surface imder treatment to all parts of the,

body of solvents alike. 4,

For the purposes of this invention I prefer to use butyric acid. By the term butyric I wish it to be understood that I mean either normal butyric or isobutyric acid or a mixture of the two. This may be mixed with benzol or one 'or more substances allied' thereto inV their solvent properties such-as the 4benzol homologues,including. toluol, xylol and cumene; the petroleumhydrocarbons, such as benzin and kerosene; the chlo- Serial N o. 387,273.

rinated hydrocarbons, such as carbon tetrachlorid and chlorbenzol; the simple ethers such as methyl, ethyl and amyl ethers, and compound ethers such as methyl, ethyl and amyl acetates; and carbon disulid. Ethyl alcohol or one or more substances having similar solvent properties may also be added, such as methyl, amyl and denatured alcohols; the ketones, as acetone, methyl acetone, which as is Well known contains methyl alcohol, acetone and other ketonic solvents, methyl ethyl ketone, acetone oil, butyrone ztmd pinacolin; and lightoil of hard wood ar. kind to this mixture to retard the evaporation of the solvents, although I do not con- Sider this essential. Among such substances that are useful in this. connection may be mentioned wood flour, starch, Whiting, infusorial earth, the soaps, -the waxes and nitrocellulose. These thickners when added are incorporated during agitation so as t0 secure as homogeneous a mixture as possible.

more of the solvents are rst incorporated in the solvents. which dissolve them most readily.

An illustrative remover of this kind adapted for application in a thin layer to the surface being treated is: methyl acetone, 30 parts; benzol, 25y parts; butyric acid, 4 parts, and ceresin wax, 1 part.

For dipping or tank work a remover of this character might be used with advantage: denatured alcohol, Ll0 parts; methyl-ethyl ketone, 25 parts; butyric acid, 6 parts, and ceresin wax, i part.

rlhe -stiifeningmaterial may be omitted altogether from this composition ifV desired.

Other vsolvents from the preceding lists, such as suitable proportions of one or more chlorinated solvent salcoho1s, ethers, esters, ketones or tar oils mentioned, might, of

course, be added to or substituted in the above compositions. In some of these mixtures reaction probably takes place between I preferably add a thickener of some p yThose thickeners which are soluble in one or methyl acetonethirty parts, benzol twentyve parts, butyric acid four parts and ceresin wax one part.

2. The finish remover comprising approximately ketonic and alcoholic solvents 4 6.- `Thefinish remover consisting substanstantially of methyl acetone thirty parts,

benzol twenty-five parts, butyric acid four 20 parts and incorporated sti'ening material.

7. The finish remover comprising large proportions of composite volatile finish softening material, a few per cent. at least of butyric acid and incorporated thickening z5 material.

In testimony whereof I have hereunto signed my name in the presence of two Witnesses.

oAnLEToN ELLIS.

Witnesses:

SAMUEL R. BELL, HARRY W.. BROWN.j 

